Dental chair back



FIG. 1 is a right side perspective view of the dental chair back showing our new design;

FIG. 2 is a right side view, the left side view being a mirror image thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines shown herein are for illustrative purposes only and form no part of the claimed design. 

We claim the ornamental design for a dental chair back, as shown and described. 